Thornton, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thornton, a community in San Joaquin County, California.
This Afternoon
87°F
Sunny
Sunny, with a high near 87. Northwest wind around 9 mph.
7-day forecast for Thornton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 87°F | Sunny | 9 mph NW | 0% |
| Tonight | 55°F | Clear | 3 to 9 mph WSW | 0% |
| Saturday | 90°F | Sunny | 2 to 7 mph WSW | 0% |
| Saturday Night | 56°F | Partly Cloudy | 2 to 7 mph SW | 0% |
| Sunday | 84°F | Partly Sunny | 3 to 8 mph WSW | 0% |
| Sunday Night | 55°F | Mostly Cloudy | 5 to 9 mph WSW | 0% |
| Monday | 87°F | Sunny | 5 to 9 mph W | 0% |
| Monday Night | 55°F | Mostly Clear | 5 to 9 mph WSW | 0% |
| Tuesday | 89°F | Sunny | 3 to 7 mph W | 0% |
| Tuesday Night | 57°F | Clear | 1 to 7 mph WSW | 0% |
| Wednesday | 95°F | Sunny | 0 to 3 mph WNW | 0% |
| Wednesday Night | 61°F | Mostly Clear | 2 mph WNW | 0% |
| Thursday | 97°F | Sunny | 0 to 6 mph WNW | 0% |
| Thursday Night | 61°F | Mostly Clear | 6 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Thornton (38.230, -121.426). Updated through the day.
Growing snapshot for Thornton
Last spring frost
Feb 9
First fall frost
Dec 5
Growing season
301 days
Hardiness zone
9b
More local growing data for Thornton: nearby ZIP 95242 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Lodi, Ca (5.7 mi from Thornton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.